(Reuters) - China-based Sogou Inc's shares rose more than 10 percent in their U.S. market debut, as investors expect a massive base of Chinese smartphone users to help the Tencent-backed search engine company narrow the gap with market leader Baidu.

(Reuters) - China-based Sogou Inc's shares rose more than 10 percent in their U.S. market debut, as investors expect a massive base of Chinese smartphone users to help the Tencent-backed search engine company narrow the gap with market leader Baidu.